Last month, at a livestreamed Tesla investor event that went short on new cars and long on grandiose narratives, a minor detail in Elon Musk’s “Master Plan Part 3” made big news in an obscure corner of physics. Colin Campbell, an executive in Tesla’s powertrain division, announced that his team was expunging rare-earth magnets from its motors, citing supply chain concerns and the toxicity of producing them.
To emphasize the point, Campbell clicked between a pair of slides referring to three mystery materials, helpfully labeled Rare Earths 1, 2, and 3. On the first slide, representing Tesla’s present, the amounts range from a
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